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git.ipfire.org Git - thirdparty/systemd.git/blob - src/core/killall.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 ProFUSION embedded systems
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "alloc-util.h"
29 #include "formats-util.h"
31 #include "parse-util.h"
32 #include "process-util.h"
34 #include "string-util.h"
35 #include "terminal-util.h"
38 #define TIMEOUT_USEC (10 * USEC_PER_SEC)
40 static bool ignore_proc(pid_t pid
) {
41 _cleanup_fclose_
FILE *f
= NULL
;
48 /* We are PID 1, let's not commit suicide */
52 r
= get_process_uid(pid
, &uid
);
54 return true; /* not really, but better safe than sorry */
56 /* Non-root processes otherwise are always subject to be killed */
60 p
= procfs_file_alloca(pid
, "cmdline");
63 return true; /* not really, but has the desired effect */
65 count
= fread(&c
, 1, 1, f
);
67 /* Kernel threads have an empty cmdline */
71 /* Processes with argv[0][0] = '@' we ignore from the killing
74 * http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons */
75 if (count
== 1 && c
== '@')
81 static void wait_for_children(Set
*pids
, sigset_t
*mask
) {
86 if (set_isempty(pids
))
89 until
= now(CLOCK_MONOTONIC
) + TIMEOUT_USEC
;
97 /* First, let the kernel inform us about killed
98 * children. Most processes will probably be our
99 * children, but some are not (might be our
100 * grandchildren instead...). */
104 pid
= waitpid(-1, NULL
, WNOHANG
);
111 log_error_errno(errno
, "waitpid() failed: %m");
115 (void) set_remove(pids
, PID_TO_PTR(pid
));
118 /* Now explicitly check who might be remaining, who
119 * might not be our child. */
120 SET_FOREACH(p
, pids
, i
) {
122 /* We misuse getpgid as a check whether a
123 * process still exists. */
124 if (getpgid(PTR_TO_PID(p
)) >= 0)
133 if (set_isempty(pids
))
136 n
= now(CLOCK_MONOTONIC
);
140 timespec_store(&ts
, until
- n
);
141 k
= sigtimedwait(mask
, NULL
, &ts
);
144 if (k
< 0 && errno
!= EAGAIN
) {
145 log_error_errno(errno
, "sigtimedwait() failed: %m");
150 log_warning("sigtimedwait() returned unexpected signal.");
155 static int killall(int sig
, Set
*pids
, bool send_sighup
) {
156 _cleanup_closedir_
DIR *dir
= NULL
;
159 dir
= opendir("/proc");
163 while ((d
= readdir(dir
))) {
167 if (d
->d_type
!= DT_DIR
&&
168 d
->d_type
!= DT_UNKNOWN
)
171 if (parse_pid(d
->d_name
, &pid
) < 0)
174 if (ignore_proc(pid
))
177 if (sig
== SIGKILL
) {
178 _cleanup_free_
char *s
= NULL
;
180 get_process_comm(pid
, &s
);
181 log_notice("Sending SIGKILL to PID "PID_FMT
" (%s).", pid
, strna(s
));
184 if (kill(pid
, sig
) >= 0) {
186 r
= set_put(pids
, PID_TO_PTR(pid
));
190 } else if (errno
!= ENOENT
)
191 log_warning_errno(errno
, "Could not kill %d: %m", pid
);
194 /* Optionally, also send a SIGHUP signal, but
195 only if the process has a controlling
196 tty. This is useful to allow handling of
197 shells which ignore SIGTERM but react to
198 SIGHUP. We do not send this to processes that
199 have no controlling TTY since we don't want to
200 trigger reloads of daemon processes. Also we
201 make sure to only send this after SIGTERM so
202 that SIGTERM is always first in the queue. */
205 if (get_ctty_devnr(pid
, NULL
) >= 0)
210 return set_size(pids
);
213 void broadcast_signal(int sig
, bool wait_for_exit
, bool send_sighup
) {
214 sigset_t mask
, oldmask
;
215 _cleanup_set_free_ Set
*pids
= NULL
;
218 pids
= set_new(NULL
);
220 assert_se(sigemptyset(&mask
) == 0);
221 assert_se(sigaddset(&mask
, SIGCHLD
) == 0);
222 assert_se(sigprocmask(SIG_BLOCK
, &mask
, &oldmask
) == 0);
224 if (kill(-1, SIGSTOP
) < 0 && errno
!= ESRCH
)
225 log_warning_errno(errno
, "kill(-1, SIGSTOP) failed: %m");
227 killall(sig
, pids
, send_sighup
);
229 if (kill(-1, SIGCONT
) < 0 && errno
!= ESRCH
)
230 log_warning_errno(errno
, "kill(-1, SIGCONT) failed: %m");
233 wait_for_children(pids
, &mask
);
235 assert_se(sigprocmask(SIG_SETMASK
, &oldmask
, NULL
) == 0);